The audit reviewed the operations of the Civil Aviation Authority (CASA), which has prime responsibility for regulating aviation safety in Australia. The audit objectives were to assess the efficiency and effectiveness of the management systems and procedures used by CASA to ensure compliance with regulatory controls by Air Operator's Certificate holders operating passenger-carrying aircraft within High Capacity Regular Public Transport; Low Capacity Regular Public Transport and charter industry sectors; and Certificate of Approval holders. Aviation safety compliance includes entry control, surveillance and enforcement.